Add nagios-check-running-kernel

git-svn-id: svn+ssh://asteria.noreply.org/svn/weaselutils/trunk@344 bc3d92e2-beff-0310-a7cd-cc87d7ac0ede

1 files changed, 107 insertions, 0 deletions

diff --git a/nagios-check-running-kernel b/nagios-check-running-kernel
new file mode 100755
index 0000000..818288f
--- /dev/null
+++ b/nagios-check-running-kernel
@@ -0,0 +1,107 @@
+#!/bin/bash
+
+# Check if the running kernel has the same version string as the on-disk
+# kernel image.
+
+# Copyright 2008 Peter Palfrader
+#
+# Permission is hereby granted, free of charge, to any person obtaining
+# a copy of this software and associated documentation files (the
+# "Software"), to deal in the Software without restriction, including
+# without limitation the rights to use, copy, modify, merge, publish,
+# distribute, sublicense, and/or sell copies of the Software, and to
+# permit persons to whom the Software is furnished to do so, subject to
+# the following conditions:
+#
+# The above copyright notice and this permission notice shall be
+# included in all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+OK=0;
+WARNING=1;
+CRITICAL=2;
+UNKNOWN=3;
+
+get_offset() {
+	local file needle
+
+	file="$1"
+	needle="$2"
+	perl -e '
+		undef $/;
+		$i = index(<>, "'"$needle"'");
+		if ($i < 0) {
+			exit 1;
+		};
+		print $i,"\n"' < "$file"
+}
+
+get_image() {
+	local image GZHDR1 GZHDR2 off
+
+	image="$1"
+
+	GZHDR1="\x1f\x8b\x08\x00"
+	GZHDR2="\x1f\x8b\x08\x08"
+
+	off=`get_offset "$image" $GZHDR1`
+	[ "$?" != "0" ] && off="-1"
+	if [ "$off" -eq "-1" ]; then
+		off=`get_offset "$image" $GZHDR2`
+		[ "$?" != "0" ] && off="-1"
+	fi
+	if [ "$off" -eq "0" ]; then
+		zcat < "$image"
+		return
+	elif [ "$off" -ne "-1" ]; then
+		(dd ibs="$off" skip=1 count=0 && dd bs=512k) < "$image"  2>/dev/null | zcat 2>/dev/null
+		return
+	fi
+
+	echo "ERROR: Unable to extract kernel image." 2>&1
+	exit 1
+}
+
+searched=""
+for on_disk in \
+	"/boot/vmlinuz-`uname -r`"\
+	"/boot/vmlinux-`uname -r`"; do
+
+	if [ -e "$on_disk" ]; then
+		on_disk_version="`get_image "$on_disk" | strings | grep 'Linux version' | head -n1`"
+		[ -z "$on_disk_version" ] || break
+		on_disk_version="`cat "$on_disk" | strings | grep 'Linux version' | head -n1`"
+		[ -z "$on_disk_version" ] || break
+
+		echo "UNKNOWN: Failed to get a version string from image $on_disk"
+		exit $UNKNOWN
+	fi
+	searched="$searched $on_disk"
+done
+
+if ! [ -e "$on_disk" ]; then
+	echo "WARNING: Did not find a kernel image (checked$searched) - I have no idea which kernel I am running"
+	exit $WARNING
+fi
+
+
+running_version="`cat /proc/version`"
+if [ -z "$running_version" ] ; then
+	echo "UNKNOWN: Failed to get a version string from running system"
+	exit $UNKNOWN
+fi
+
+if [ "$running_version" != "$on_disk_version" ]; then
+	echo "WARNING: Running kernel does not match on-disk kernel image: [$running_version != $on_disk_version]"
+	exit $WARNING
+else
+	echo "OK: Running kernel matches on disk image: [$running_version]"
+	exit $OK
+fi